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System and method of determining skeletal muscle contraction by serial lead impedance measurements
| Details |
Inventors: Grandjean, Pierre Andre; Francischelli, David E.; Gealow, Kendra K.; Leinders, Robert; Bakx, Martinus A. G. M.; Weijand, Koen J.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Layno; Carl H.
Assistant Examiner:
Attorney, Agent or Firm: Woods; Thomas F., Jaro; Michael J., Patton; Harold
There is provided a system and method for continually monitoring the occurrence of contraction during stimulation of skeletal muscle which is employed in a cardiac assist-type system. During delivery of a periodic burst, or train of stimulus pulses, the impedance of the muscle between the electrodes through which the pulses are delivered is monitored, and evaluated to determine whether or not stimulation has been achieved. In a particular embodiment, the impedance and impedance derivative values are accumulated throughout the burst, and assessed to determine whether the impedance change corresponded to a full muscle contraction. In the event of failure to stimulate the muscle to contraction, the system can automatically adjust the pulse output parameters to achieve reliable contraction. |
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DETAILED DESCRIPTION There is provided a system and method for stimulating skeletal muscle as part of a therapeutic procedure, which includes determining when delivered stimulation has evoked contraction of the skeletal muscle.
The system provides a controllable pulse generator for periodically generating a burst of stimulus pulses and leads for delivering the bursts to electrodes in the skeletal muscle, and impedance measuring circuitry for measuring the impedance between the electrodes at the time of each pulse of the series.
The impedance measurements are processed, preferably including obtaining the derivative or change in impedance for each pulse burst, and the impedance data is analyzed to determine whether it reflects a full muscle contraction.
In the event of determinations of no contraction, the system includes a feedback mechanism for adjusting the power output of the burst pulses, so as to provide cyclical stimulation sufficiently above threshold to provide reliable muscle contraction.
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